Question

the resistance of a wire is R the lenght of wire is doubled by streaching the new resistance will be ​

Answer 1

Answer:

Given

Resistance of wire=R

we have

$resistance\alpha \frac{length \: of \: wire}{area \: of \: cross \: section \: of \: wire}$

Length is doubled by stretching decreases the area of cross section to 1/2

(Since volume of the wire is constant)

So

Resistance of the wire becomes 4R

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